CN107783031A

CN107783031A - The failure detector and method of high-pressure system and its power switching modules

Info

Publication number: CN107783031A
Application number: CN201610781216.5A
Authority: CN
Inventors: 赵启; 刘莹莹; 黄付丽; 吕冯麟; 张达
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2016-08-30
Filing date: 2016-08-30
Publication date: 2018-03-09
Anticipated expiration: 2036-08-30
Also published as: CN107783031B

Abstract

The invention discloses a kind of high-pressure system and its failure detector and method of power switching modules, the device to include：High-tension electricity source and low tension source；Changeover module, its first end are connected with high-tension electricity source, and its second end is connected with low tension source, and its 3rd end is connected with the feeder ear of power switching modules, and it is used to control high-tension electricity source or low tension source to power to power switching modules；Drive circuit, it is used for driving power switch module；Current sample module, it is used for the electric current of sampled power switch module；Controller, it is used to be controlled changeover module and drive circuit, to control low tension source to be powered to power switching modules and control power switching modules to be operated in default detection state, and according to current sample module samples to the electric currents of power switching modules judge whether power switching modules break down.The present invention carries out the fault detect of power switching modules using low-tension supply, improves security of system.

Description

The failure detector and method of high-pressure system and its power switching modules

Technical field

The present invention relates to technical field of vehicle, the fault detect dress of power switching modules in more particularly to a kind of high-pressure system Put, in a kind of high-pressure system, a kind of electric automobile and a kind of high-pressure system power switching modules fault detection method.

Background technology

As the increasingly popularization and power system of new-energy automobile are in largely alternatively old-fashioned fossil energy system, work( Rate switching device (such as IGBT, MOSFET, BJT, controllable silicon) is also more and more applied to present power system.Based on pair The consideration of efficiency of transmission, operating efficiency, power and design cost, the voltage more and more higher used in related automobile, can reach 320V to 900V, and then the failure risk of device for power switching is also increasing.Device for power switching is easily by electrostatic and temperature Influence and break down, generic failure shows as three pin all-pass.In the related art, the fault detect of device for power switching is usual Using two ways once：

First, by artificial detection.But it has the drawback that, complex operation, and security risk ratio are artificially detected It is larger；

Second, it whether there is high current in circuit to detect to realize fault detect by high-pressure system power supply is connected.But It is that it has the drawback that, if directly connecting high-pressure system power supply in the case of device for power switching is faulty, is not having In the case of short-circuit protection, very high risk can be caused to high-pressure system, the load of heating class will continuous heating heating, electric machinery Then direct short-circuit is burnt or even triggers security incident for load.

Therefore, correlation technique needs to be improved.

The content of the invention

It is contemplated that at least solves one of technical problem in correlation technique to a certain extent.Therefore, the present invention For first purpose in a kind of failure detector of the power switching modules in high-pressure system is proposed, the device can be in high pressure system First carry out the fault detect of power switching modules on system before electricity using low pressure.

Second object of the present invention is to propose a kind of high-pressure system.Third object of the present invention is to propose one kind Electric automobile.Fault detection method of the fourth object of the present invention in the power switching modules in a kind of high-pressure system is proposed.

In order to achieve the above object, power switching modules in a kind of high-pressure system that first aspect present invention embodiment proposes Failure detector, including：High-tension electricity source and low tension source, wherein, the first power supply that the high-tension electricity source provides Voltage is more than the second source voltage that the low tension source provides；Changeover module, the first end of the changeover module with it is described High-tension electricity source is connected, and the second end of the changeover module is connected with the low tension source, the 3rd end of the changeover module It is connected with the feeder ear of the power switching modules, the changeover module is used to control the high-tension electricity source or the low tension Source is powered to the power switching modules；Drive circuit, the control pole phase of the drive circuit and the power switching modules Even, to drive the power switching modules；Current sample module, the current sample module are used to sample the power switch mould The electric current of block；Controller, the controller respectively with the changeover module, the drive circuit and the current sample module phase Even, the controller be used for the changeover module and the drive circuit are controlled, with control the low tension source to The power switching modules are powered and control the power switching modules to be operated in default detection state, and according to the electric current The electric current for the power switching modules that sampling module samples judges whether the power switching modules break down.

The failure detector of power switching modules in the high-pressure system proposed according to embodiments of the present invention, high-tension electricity source It is connected with low tension source by changeover module with the feeder ear of power switch pipe, controller is controlling high-tension electricity source to power Before switch module power supply, first control low tension source to be powered to power switching modules and control power switching modules to be operated in Default detection state, the electric current of current sample module samples power switch pipe, and then, controller is according to current sample module samples To current value judge whether power switching modules break down.Thus, the embodiment of the present invention is controlling high-tension electricity source to work( Before the power supply of rate switch module, low-tension supply can be used to carry out the fault detect of power switching modules, so as to greatly reduce The risk of fault detect, prevent to cause accident because of power switching modules failure, avoid the load in circuit and other portions The circuit divided is damaged by high-voltage great-current, improves the safety and reliability of system.

According to one embodiment of present invention, the power switching modules include at least one branch road, and each branch road includes At least one power switch pipe, wherein, the current sample module includes at least one current sampling unit, described at least one Current sampling unit is used for the corresponding electric current for gathering at least one branch road, and the controller is used for the electricity according to each branch road Stream judges whether each power switch pipe breaks down in respective branch.

To reach above-mentioned purpose, a kind of high-pressure system that second aspect of the present invention embodiment proposes, including the embodiment High-pressure system in power switching modules failure detector.

The high-pressure system proposed according to embodiments of the present invention, examined by the failure of power switching modules in above-mentioned high-pressure system Device is surveyed, before control high-tension electricity source is powered to power switching modules, low-tension supply can be used to carry out power switch mould The fault detect of block, so as to greatly reduce the risk of fault detect, prevent because of power switching modules to cause thing so hindering Therefore avoid the circuit of load in circuit and other parts from being damaged by high-voltage great-current, improve the security of system and reliable Property.To reach above-mentioned purpose, a kind of electric automobile that third aspect present invention embodiment proposes, include the high pressure of the embodiment System.

The electric automobile proposed according to embodiments of the present invention, by above-mentioned high-pressure system, high-tension electricity source is being controlled to work( Before the power supply of rate switch module, low-tension supply can be used to carry out the fault detect of power switching modules, so as to greatly reduce The risk of fault detect, prevent to cause accident because of power switching modules failure, avoid the load in circuit and other portions The circuit divided is damaged by high-voltage great-current, improves the safety and reliability of automobile.To reach above-mentioned purpose, the present invention the 4th The fault detection method of power switching modules, the failure detector include in a kind of high-pressure system that aspect embodiment proposes High-tension electricity source and low tension source, the first supply voltage that the high-tension electricity source provides provide more than the low tension source Second source voltage, the described method comprises the following steps：Sample the electric current of the power switching modules；Control the low tension Source powers and controlled the power switching modules to be operated in default detection state to the power switching modules, and according to adopting Sample to the electric currents of the power switching modules judge whether the power switching modules break down.

The fault detection method of power switching modules in the high-pressure system proposed according to embodiments of the present invention, first failure again Control low tension source to be powered to power switching modules under detection pattern, and control power switch pipe to be operated in default detection shape The electric current of state, then sampled power switch module, and power switch mould is judged according to the electric current of the power switching modules sampled Whether block breaks down.Thus, the embodiment of the present invention can make before control high-tension electricity source is powered to power switching modules The fault detect of power switching modules is carried out with low-tension supply, so as to greatly reduce the risk of fault detect, prevent because The problem of power switching modules failure causes security incident, the circuit of load in circuit and other parts is avoided by the big electricity of high pressure Stream damage, improve the safety and reliability of system.

Brief description of the drawings

Fig. 1 is the square frame signal of the failure detector of power switching modules in high-pressure system according to embodiments of the present invention Figure；

Fig. 2 is the failure detector of power switching modules in the high-pressure system according to a specific embodiment of the invention Circuit diagram；

Fig. 3 is the square frame of the failure detector of power switching modules in high-pressure system according to an embodiment of the invention Schematic diagram；

Fig. 4 is the side of the failure detector of power switching modules in high-pressure system in accordance with another embodiment of the present invention Frame schematic diagram；

Fig. 5 is the side of the failure detector of power switching modules in the high-pressure system according to another embodiment of the invention Frame schematic diagram；

Fig. 6 is the block diagram of high-pressure system according to embodiments of the present invention；

Fig. 7 is the block diagram of electric automobile according to embodiments of the present invention；

Fig. 8 is the flow chart of the fault detection method of power switching modules in high-pressure system according to embodiments of the present invention；

Fig. 9 is the fault detection method of power switching modules in the high-pressure system according to a specific embodiment of the invention Flow chart；And

Figure 10 is the fault detect side of power switching modules in the high-pressure system according to another specific embodiment of the invention The flow chart of method.

Reference：

Failure detector 100, high-tension electricity source 10, low-tension supply 20, changeover module 30, drive circuit 60, electric current are adopted Egf block 70 and controller 80；

Feeder ear 40, power switching modules 50 and input/output module 90；

First relay 301, the second relay 302 and counnter attack protection circuit 303；

Power switch pipe 502, upper bridge power switch pipe 503 and lower bridge power switch pipe 504；

Current sampling unit 701 and load 501；High-pressure system 200 and electric automobile 300.

Embodiment

Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.

Below with reference to the accompanying drawings come describe the embodiment of the present invention proposition high-pressure system in power switching modules fault detect Apparatus and method, high-pressure system and electric automobile.

Fig. 1 is the square frame signal of the failure detector of power switching modules in high-pressure system according to embodiments of the present invention Figure.As shown in figure 1, the failure detector 100 includes：High-tension electricity source 10, low-tension supply 20, changeover module 30, driving electricity Road 60, current sample module 70 and controller 80.

Wherein, high-tension electricity source 10 is used for the first supply voltage U1 provided, and low tension source 20 is used for second provided Supply voltage U2, the first supply voltage U1 that high-tension electricity source 10 provides are more than the second source voltage that low tension source 20 provides U2；The first end of changeover module 30 is connected with high-tension electricity source 10, and the second end of changeover module 30 is connected with low tension source 20, 3rd end of changeover module 30 is connected with the feeder ear 40 of power switching modules 50, and changeover module 30 is used to control high-tension electricity source 10 or low tension source 20 powered to power switching modules 50；Drive circuit 60 is connected with the control pole of power switching modules 50, With driving power switch module 50；Current sample module 70 is used for the electric current of sampled power switch module 50；Controller 80 is distinguished It is connected with changeover module 30, drive circuit 60 and current sample module 70, controller 80 is used for changeover module 30 and driving electricity Road 60 is controlled, to control low tension source 20 to power and control power switching modules 50 to work to power switching modules 50 In default detection state, and the electric current of the power switching modules 50 sampled according to current sample module 70 judges power switch mould Whether block 50 breaks down.The general failure detector 100 is operated under fault detect pattern.

Specifically, as shown in figure 1, the power supply of high-tension electricity source 10, power switching modules 50 and power switching modules 50 End 40 may be configured to high-pressure system 101, also, low tension source 20, drive circuit 60, current sample module 70 and controller 80 It may be configured to low-pressure system 102.

Wherein, the feeder ear 40 of power switching modules 50 may include high-pressure connection line beam, and it is used to transfer electrical energy into respectively In the load of individual branch road.High-tension electricity source 10 can be connected with high voltage power supply, and high voltage power supply is by high-tension electricity source 10 in normal work High-pressure system 101 is powered when making, wherein, high voltage power supply can be the high-tension battery on electric automobile, the electricity of high voltage power supply Pressure value is that the first supply voltage U1 can be any voltage value in 200V to 900V.Low tension source 20 can be with low-tension supply phase Even, low-tension supply is powered by low tension source 20 to low-pressure system 102, wherein, low-tension supply can be by electric automobile 12V batteries or 24V batteries provide, low-tension supply may also include DC/DC converters, by the voltage transformation of battery For the voltage needed for electricity consumption module in system.So, high voltage power supply and low-tension supply can pass through changeover module 30 and power respectively The feeder ear 40 of switching tube 50 connects, and to be respectively that power switch pipe 50 is powered, and low-tension supply can also be drive circuit 60th, current sample module 70 and controller 80 are powered.In an embodiment of the present invention, failure is being carried out to power switching modules 50 During detection, low-tension supply is connected with high-pressure system, so that high-pressure system simulates normal working condition using low-tension supply.

According to the specific embodiment of the present invention, drive circuit 60 may include driving chip and related peripheral circuit, The control signal that drive circuit 60 is used to send controller 80 is amplified, to reach needed for driving power switch module 50 Voltage, and then driving power switch module 50 is switched on or off.It should be noted that drive circuit 60 may also include excessively stream and Short-circuit protection circuit, low-tension supply or high voltage power supply can be that drive circuit 60 is powered after decompression is handled.

According to the specific embodiment of the present invention, controller 80 may include MCU (Microcontroller Unit, it is micro- Control unit) chip, computer, programmable controller and supporting ancillary equipment is such as serial line interface and display chip. In embodiments of the invention, controller 80 can be programmed, and sent control signal according to program and control instruction and cut with controlling Change component 30 and drive circuit 60.Further, controller 80 can obtain the power switching modules of the sampling of current sample module 70 50 electric current, and judge whether power switching modules 50 break down according to the current value of the power switching modules 50 sampled. In some embodiments of the invention, the inside of controller 8 can integrate analog-to-digital conversion module, or can use voltage comparator or The analog-to-digital conversion module of person's independence replaces the analog-to-digital conversion module in controller 8.

Specifically, electricity i.e. controller 80 controls high-tension electricity source 10 to be carried out to power switching modules 50 on horizontal high voltage is entered Before power supply, fault detect first can be carried out to power switching modules 50, controller 80 is by controlling changeover module 30 so that low pressure Power end 20 is powered to power switching modules 50, and is switched by the driving power switch module 50 of drive circuit 60 with driving power Module 50 is operated in default detection state.

Further, when power switching modules 50 are operated in default detection state, current sample module 70 detects in real time The electric current of power switching modules 50 is flowed through, specifically, current sample module 70 may include Hall current sampling element or sampling electricity Resistance, can directly be obtained by Hall current sampling element or can be divided by the sampling resistor in the embodiment shown in Fig. 2 The electric current that power switching modules 50 are flowed through in big rear acquisition is pressed, wherein, this is no longer going to repeat them for the concrete structure of sample circuit. And then after controller 80 receives the electric current that current sample module 70 samples, electric current is analyzed and processed, and judge work( Whether rate switch module 50 breaks down.

If controller 80 judges that power switching modules 50 break down, alert, and can be by high-pressure system Connection between 101 and other systems disconnects, to isolate the high-pressure system 101；If controller 80 judges power switching modules 50 do not break down, then control high-tension electricity source 10 to be powered to power switching modules 50, and control low tension source 20 stop to Power switching modules 50 are powered.

Thus, the embodiment of the present invention can use low pressure before control high-tension electricity source is powered to power switching modules Power supply carries out the fault detect of power switching modules, so as to greatly reduce the risk of fault detect, prevents because power is opened Close module failure and cause accident, avoid the circuit of the load in circuit and other parts from being damaged by high-voltage great-current, improve The safety and reliability of system.

With reference to Fig. 2-5, to the failure detector 100 of power switching modules in the high-pressure system of the embodiment of the present invention Particular circuit configurations and operation principle illustrate.

According to one embodiment of present invention, as shown in Fig. 2 changeover module 30 includes：First relay 301 and second after Electrical equipment 302, wherein, the first end of the switch of the first relay 301 is connected with high-tension electricity source 10, and the first relay 301 is opened The second end closed is connected with the feeder ear 40 of power switching modules 50, and the coil K1 of the first relay 301 is connected with controller 80； The first end of the switch of second relay 302 is connected with low tension source 20, the second end of the switch of the second relay 302 and work( The feeder ear 40 of rate switch module 50 is connected, and the coil K2 of the second relay 302 is connected with controller 80；Wherein, controller 80 By controlling the switch of the first relay 301 to open so that high-tension electricity source 10 is powered to power switching modules 50, and passes through control The switch for making the second relay 302 is opened so that low tension source 20 is powered to power switching modules 50.

It should be noted that the first relay 301 and the second relay can be replaced using independent power semiconductor Device 302, wherein, power semiconductor can be realized and be switched on or off under the control of controller 80, by circuit from low-tension supply Power supply state switches to high voltage power supply power supply state.

According to one embodiment of present invention, as shown in Fig. 2 changeover module 30 also includes being connected to the second relay 302 Counnter attack protection circuit 303 between the feeder ear 40 of power switching modules 50.Wherein, counnter attack protection circuit 303 may include two Pole pipe D1, diode D1 negative electrode are connected with the feeder ear 40 of rate switch module 50, diode D1 cathode anode and second after Second end of the switch of electrical equipment 302 is connected, and specifically, diode D1 can be high voltage bearing diode, utilize diode D1 list To on state characteristic, it can prevent that high voltage power supply burns low-tension supply under fortuitous event, to protect low-tension supply.

It should be noted that counnter attack protection circuit 303 is used to protect low-tension supply, changeover module 30 can not also Using counnter attack protection circuit 303.

According to the specific embodiment of the present invention, as shown in Fig. 2 power switch in the high-pressure system of the embodiment of the present invention The failure detector 100 of module 50 also includes input/output module 90, wherein, input/output module 90 is used to realize and user Between information exchange, input/output module 90 may include input equipment and output equipment, wherein, input equipment includes touching Screen, keyboard, button, gesture and sound etc., input equipment are used to obtain user instruction；Output equipment includes screen, indicator lamp, beaten Printing apparatus and sound etc., output equipment are used to feed back fault detection information, issue the user with during breaking down in circuit and carry Show information.In an embodiment of the present invention, input/output module 90 can be attached with other electric-control systems, be collectively formed more Integrated comprehensive system.

According to one embodiment of present invention, as shown in Figure 2-5, power switching modules 50 include at least one branch road, often Individual branch road includes at least one power switch pipe 502, wherein, current sample module 70 includes at least one current sampling unit 701, at least one current sampling unit 701 is used for the corresponding electric current for gathering at least one branch road, and controller 80 is used for according to every The electric current of individual branch road judges whether each power switch pipe breaks down in respective branch.

According to the specific embodiment of the present invention, power switch pipe 502 can be MOSFET (Metal-Oxide- Semiconductor Field-Effect Transistor, metal-oxide half field effect transistor), BJT (Bipolar Junction Transistor, bipolar junction transistor) or IGBT (Insulated Gate BipolarTransistor, insulated gate pair Bipolar transistor).Illustrated in Fig. 2-5 of the present invention embodiment by taking IGBT as an example.

, wherein it is desired to explanation, power switch pipe 502 have three poles of GCE (or BCE), wherein, B poles (or G poles) For the control pole of power switch pipe 502, the emitter stage of the C extremely colelctor electrode of power switch pipe 502, E extremely power switch pipes, drive Dynamic circuit 60 is connected with the control pole of power switch pipe 502, to control turning on and off for power switch pipe 502, and then controls Power switching modules 50 are operated in default detection state.

Specifically, when power switch pipe 502 does not break down, if the B poles (or G poles) of power switch pipe 502 connect Receive shut-off control signal i.e. power switch pipe 502 to be held off, then the resistance at the C poles of power switch pipe 502 and E poles both ends reaches To tens of megaohms；If the B poles (or G poles) of power switch pipe 502 receive, to open control signal i.e. power switch pipe open-minded, The C poles of power switch pipe and the equivalent resistance at E poles both ends are 0.When power switch pipe 502 breaks down, power switch pipe 502 The pole of B, C, E (or G, C, E) three between resistance characteristic change, normally behave as resistance and be greatly lowered, work as power switch The C poles and E poles both ends of pipe 502 have the B poles of voltage but power switch pipe (or G poles) receive shut-off control signal when, flow through work( The electric current I increases of rate switch module 50.So, controller 80 can judge the power in each branch road according to the electric current of each branch road Whether switching tube breaks down.

According to the present invention a specific embodiment, as shown in Figure 2-5, in the power switching modules 50 of the embodiment of the present invention Power switch pipe 502 can use a variety of connected modes, i.e. three-phase bridge connection, H bridge type connects, is connected in parallel and is connected in series. More specifically, power switching modules 50 can be connected with load 501, it is powered or powers off with control load 501, such as be connected in parallel With in the circuit that is connected in series, load 501 can be sense the heat coil of heating, carry out self-heating resistive load, Work electromagnet and Unidirectional direct-current motor etc., in the circuit of three-phase bridge connection, load 501 can be threephase asynchronous machine, In the circuit of H bridge type connection, load 501 can be single-phase asynchronous motor., wherein it is desired to explanation, those skilled in the art 501 connected mode and particular location in circuit of load can be changed according to being actually needed.

According to one embodiment of present invention, as shown in figure 3, when each branch road includes a power switch pipe 502, control Device 80 processed is used to control low tension source 20 to power to power switching modules 50, and controls the power switch pipe 502 of each branch road Shut-off, if electric current I of any one branch road when power switch pipe 502 turns off is more than the first current threshold I1, controller 80 is then Judge that the power switch pipe of the branch road breaks down.

In an embodiment of the present invention, power switching modules 50 include multiple branch roads, and each branch road includes a power Switching tube 502.When controller 80 exports shut-off control signal to drive circuit 60, drive circuit 60 drives the work(of each branch road Rate switching tube 502 turns off, if electric current I of any one branch road when power switch pipe 502 turns off is more than the first current threshold I1, Illustrating the resistance of the power switch pipe 502 of the branch road reduces, and controller 80 then judges that event occurs for the power switch pipe 502 of the branch road Barrier.So, electric current I when can be turned off by detecting power switch pipe 502 judges whether power switch pipe breaks down.

According to one embodiment of present invention, if as shown in figure 3, each branch road is when power switch pipe 502 turns off Electric current I is respectively less than or equal to the first current threshold I1, and it is default that controller 80 then controls the power switch pipe 502 of each branch road to open Time, if each electric current I of the branch road when power switch pipe 502 is opened is all higher than the second current threshold I2, judge each The power switch pipe 502 of branch road does not break down, wherein, the second current threshold I2 is more than or equal to the first current threshold I1. In an embodiment of the present invention, in process fault detection, low-tension supply is powered to power switch pipe, with simulated high-pressure system Working condition, when control signal to drive circuit 60 is opened in the output of controller 80, drive circuit 60 drives the work(of each branch road When rate switching tube 502 is opened, if the electric current I of each branch road is all higher than the second current threshold I2, illustrate that now high-pressure system exists Normal work under simulated environment, controller 80 then judge that the power switch pipe 502 of each branch road does not break down.

According to one embodiment of present invention, if as shown in figure 3, any one branch road is when power switch pipe 502 is opened Electric current I be less than or equal to the second current threshold I2, controller 80 then judges that the power switch pipe 502 of the branch road breaks down.

According to one embodiment of present invention, as shown in figure 3, controller 80 is additionally operable to before fault detect pattern is entered Control low tension source 20 and high-tension electricity source 10 stop powering to power switching modules 50, and judge the electric current of each branch road Whether it is zero, is not zero if there is the electric current of a branch road, then judges that current sample module 70 breaks down.The present invention's In embodiment, current sample module 70 is used for the electric current I for sampling each branch road, before fault detect is carried out, it is necessary first to electricity Stream sampling module 70 carries out school zero, when the electric current I in each branch road under the original state that current sample module 70 detects is zero When, the success of 70 school of current sample module zero.And then the current value that controller 80 can sample according to current sample module 70 judges respectively Whether the power switch pipe 502 of branch road breaks down.

According to one embodiment of present invention, as shown in figure 3, judging that controller 80 is additionally operable to control when not breaking down Low tension source 20 processed stops powering to power switching modules 50, and controls high-tension electricity source 10 to be supplied to power switching modules 50 Electricity.

With reference to the specific work process of the failure detector of Fig. 3 analysis embodiment of the present invention.As shown in Figures 2 and 3, Power switching modules 50 include two branch roads, and two branch circuit parallel connection connections, and each branch road includes an IGBT.

Specifically, it is electric in high pressure as shown in figure 3, user can input start-up command by input/output module 90 Before, low-tension supply can be first passed through fault detect is carried out to power switching modules 50.Specifically, process fault detection is as follows：Control Device 80 processed can first carry out school zero to current sample module 70, that is, control the switch of the first relay 301 and the second relay 302 equal Disconnect, and then low tension source 20 and high-tension electricity source 10 stop powering to power switching modules 50, after treating circuit stability, Current sample module 70 detects the electric current of each branch road, i.e., as shown in figure 3, gathering IGBT1 by a current sampling unit 701 Electric current and pass through another current sampling unit 701 gather IGBT2 electric current.Controller 80 gathers to current sample module 70 Electric current analyzed and processed, and judge whether the electric current of each branch road is zero, that is, judge IGBT1 and IGBT2 electric current whether It is zero.It is not zero if there is IGBT electric current, i.e. IGBT1 or IGBT2 electric current are not zero, and controller 80 then controls defeated Enter output module 90 and send the first prompt message, that is, notify the failure of user's current sample module 70, and control fault detect to terminate； If the electric current that the electric current of each branch road is zero, i.e. IGBT1 and IGBT2 is zero, then the success of 70 school of current sample module zero.

After the success of the school zero of current sample module 70, controller 80 controls the switch closure of the second relay 302, will Low-tension supply is attached with high-pressure system, now, can use the normal work of the high-pressure system in low-tension supply analog circuit Make state.Further, controller 80 controls the IGBT of each branch road to turn off and for example controls IGBT1 and IGBT2 shut-offs, electric current inspection Module 70 is surveyed to detect the electric current in each branch road and the electric current sampled is sent into controller 80.Controller 80 is carried out to electric current Analyzing and processing, and judge whether that electric current I of any one branch road when IGBT is turned off is more than the first current threshold I1, if any one Electric current I of the branch road when IGBT is turned off is more than the first current threshold I1, that is, the electric current for having branch road is more than the maximum leakage that IGBT allows Electric current, controller 80 then judges that the IGBT of the branch road breaks down, and records the sequence number of the IGBT.If for example, IGBT1 electricity Stream is more than the first current threshold I1, then records IGBT1 sequence number；If IGBT2 electric current is more than the first current threshold I1, remember Record IGBT2 sequence number.Further, controller 80 controls the switch closure of the second relay 302, to control low tension source 20 Powered to power switching modules 50.Current detection module 70 continues to detect the electric current I of each branch road and sends out the electric current sampled Controller 80 is sent to, controller 80 analyzes and processes to electric current, and judges now whether the electric current I of each branch road is zero, If it is determined that the electric current I of each branch road is zero, then control input output module 90 sends the second prompt message to controller 80, i.e., The sequence number for the IGBT that user breaks down is notified, and controls fault detect to terminate；If it is determined that the electric current I of any branch road is not Zero, then control input output module 90 sends the first prompt message to controller 80, that is, notifies the failure of user's current sample module 70, And fault detect is controlled to terminate.

Further, if electric current I of each branch road when IGBT is turned off is respectively less than or equal to the first current threshold I1, control Device 80 processed, which is then sent, opens control signal, with by drive circuit 60 drive all IGBT it is of short duration open preset time.Electric current Detection module 70 detects the electric current of each branch road and the electric current sampled is sent into controller 80, and controller 80 is carried out to electric current Analyzing and processing, and judge whether that electric current I of each branch road when IGBT is opened is all higher than the second current threshold I2, if it is determined that often Electric current I of the individual branch road when IGBT is opened is all higher than the second current threshold I2, and controller 80 then judges that the IGBT of each branch road is equal Do not break down, for example, if IGBT1 and IGBT2 electric current is all higher than the second current threshold I2, controller 80 then judges IGBT1 Do not broken down with IGBT2.And then controller 80 controls switching off for the second relay 302, and control the first relay 301 switch closure, that is, control low tension source 20 to stop powering to power switching modules 50, and control high-tension electricity source 10 to Power switching modules 50 are powered, meanwhile, the control input output module 90 of controller 80 sends the 3rd prompt message, that is, notifies user Electricity in the high pressure of circuit is completed, and controls fault detect to terminate；If it is determined that electric current I of any one branch road when IGBT is opened is small In or equal to the second current threshold I2, controller 80 then judges that the IGBT of the branch road breaks down, and records the sequence number of the IGBT, For example, if IGBT1 electric current is less than or equal to the second current threshold I2, IGBT1 sequence number is recorded；If IGBT2 electricity Stream is less than or equal to the second current threshold I2, then records IGBT2 sequence number.Controller 80 controls the second relay 302 simultaneously Switch off, that is, control low tension source 20 to stop powering to power switching modules 50.And then the control input of controller 80 exports Module 90 sends the first prompt message, that is, notifies the failure of user's current sample module 70, and control fault detect to terminate.

According to the specific embodiment of the present invention, as shown in Figures 4 and 5, each branch road includes upper bridge power switch pipe 503 With lower bridge power switch pipe 504, controller 80 is used to control low tension source 20 to power to power switching modules 50, and controls every The upper bridge power switch pipe 503 of individual branch road is opened and lower bridge power switch pipe 504 turns off, if any one branch road is in upper bridge power Electric current I when switching tube 503 is opened and lower bridge power switch pipe 504 turns off is more than the first current threshold I1, and controller 80 is then sentenced The lower bridge power switch pipe 504 of the disconnected branch road breaks down.In an embodiment of the present invention, power switching modules 50 can use bridge Formula circuit, now, power switching modules 50 include multiple branch roads, and each branch road includes two power switch pipes, i.e., upper bridge work( Rate switching tube 503 and lower bridge power switch pipe 504.When being turned off under driving of the power switch pipe in drive circuit 60, if appointed Electric current I of one branch road when power switch pipe turns off is more than the first current threshold I1, illustrates the power switch pipe of the branch road Resistance reduces, and controller 80 then judges that the power switch pipe of the branch road breaks down.When controller 80 controls all upper bridge work( When rate switching tube 503 is opened and lower bridge power switch pipe 504 turns off, to judge lower bridge power switch according to the electric current I of each branch road Whether pipe 504 breaks down.

According to one embodiment of present invention, as shown in Figures 4 and 5, if each branch road is opened in upper bridge power switch pipe 503 Electric current I when logical and lower bridge power switch pipe 504 turns off is less than or equal to the first current threshold I1, and controller 80 then controls each branch The upper bridge power switch pipe 503 on road turns off and lower bridge power switch pipe 504 is open-minded, if any one branch road is in upper bridge power switch Electric current I when pipe 503 is turned off and lower bridge power switch pipe 504 is opened is more than the first current threshold I1, and controller 80 then judges should The upper bridge power switch pipe 503 of branch road breaks down.In an embodiment of the present invention, controller 80 is judging the lower bridge of each branch road Whether power switch pipe 504 breaks down and then controls all upper bridge power switch pipes 503 to turn off and lower bridge power switch Whether pipe 504 is open-minded, broken down with bridge power switch pipe 503 in the electric current I judgements according to each branch road.

According to one embodiment of present invention, as shown in Figures 4 and 5, if each branch road closes in upper bridge power switch pipe 503 Electric current I when disconnected and lower bridge power switch pipe 504 is opened is less than or equal to the first current threshold I1, and controller 80 then controls each branch The upper bridge power switch pipe 503 on road and lower bridge power switch pipe 504 open preset time, if each branch road is opened in upper bridge power Electric current I when pass pipe 503 and lower bridge power switch pipe 504 are opened is all higher than the 3rd current threshold I3, then judges each branch road Upper bridge power switch pipe 503 and lower bridge power switch pipe 504 do not break down, wherein, the 3rd current threshold I3 is more than or waited In the first current threshold I1.In an embodiment of the present invention, in process fault detection, low-tension supply supplies to power switch pipe Electricity, with the working condition of simulated high-pressure system, control signal is opened and by the driving of drive circuit 60 institute when controller 80 is sent When thering is upper bridge power switch pipe 503 and the lower bridge power switch pipe 504 to open, if the electric current I of each branch road is all higher than the 3rd electricity Threshold value I3 is flowed, illustrates now high-pressure system normal work under simulated environment, controller 80 then judges the upper bridge work(of each branch road Rate switching tube 503 and lower bridge power switch pipe 504 do not break down.

According to one embodiment of present invention, as shown in Figures 4 and 5, if any one branch road is in upper bridge power switch pipe 503 Electric current I when being opened with lower bridge power switch pipe 504 is less than or equal to the 3rd current threshold I3, and controller 80 then judges the branch road Upper bridge power switch pipe 503 or lower bridge power switch pipe 504 break down.

According to one embodiment of present invention, controller 80 is additionally operable to control low tension before fault detect pattern is entered Source 20 and high-tension electricity source 10 stop powering to power switching modules 50, and judge whether the electric current of each branch road is zero, It is not zero if there is the electric current of a branch road, then judges that current sample module 70 breaks down.

According to one embodiment of present invention, when judging not break down, controller 80 is additionally operable to control low-tension supply End 20 stops powering to power switching modules 50, and controls high-tension electricity source 10 to be powered to power switching modules 50.

With reference to the specific work process of the failure detector of Fig. 4 analysis embodiment of the present invention.As shown in figure 4, work( Rate switch module 50 may include three branch roads, and the annexation of power switch pipe connects for three-phase bridge, and each branch road includes IGBT3 and IGBT4, wherein, IGBT3 is upper bridge power switch pipe, and IGBT4 is lower bridge power switch pipe, wherein, load 501 can For threephase asynchronous machine.

Specifically, it is electric in high pressure as shown in figure 4, user can input start-up command by input/output module 90 Before, low-tension supply can be first passed through fault detect is carried out to power switching modules 50.Specifically, process fault detection is as follows：Control Device 80 processed can first carry out school zero to current sample module 70, i.e. controller 80 controls the first relay 301 and the second relay 302 Disconnect, and then low tension source 20 and high-tension electricity source 10 stop powering to power switching modules 50.Treat circuit stability it Afterwards, current sample module 70 detects the electric current of each branch road, i.e., as shown in figure 3, the current sampling unit 701 on the left side gathers the left side Flow through IGBT3 and IGBT4 electric current in branch road, flowed through in middle current sampling unit 701 collection middle branch IGBT3 and IGBT4 electric current, the current sampling unit 701 on the right gather the electric current that IGBT3 and IGBT4 are flowed through in the branch road of the right.Controller The electric current that 80 pairs of current sample modules 70 gather analyzes and processes, and judges whether the electric current of each branch road is zero.If deposit It is not zero in the electric current of a branch road, i.e. the electric current of left side branch road, middle branch or the right branch road is zero, and controller 80 then controls Input/output module 90 sends the first prompt message, that is, notifies the failure of user's current sample module 70, and control fault detect knot Beam；If the electric current of each branch road is zero, i.e. the electric current of left side branch road, middle branch or the right branch road is zero, then electric current The success of 70 school of sampling module zero.

After the success of the school zero of current sample module 70, controller 80 controls the switch closure of the second relay 302, with control Low tension source 20 processed is powered to power switching modules 50, now, can use the high-pressure system in low-tension supply analog circuit Normal operating conditions.Further, controller 80 controls the IGBT3 of each branch road to open and IGBT4 is turned off, current detecting mould Block 70 detects the electric current in each branch road, and the electric current sampled is sent into controller 80, and controller 80 divides electric current Analysis is handled, and judges whether that electric current I of any one branch road when IGBT3 is opened and IGBT4 is turned off is more than the first current threshold I1, If electric current I of any one branch road when IGBT3 is opened and IGBT4 is turned off is more than the electric current that the first current threshold I1 has branch road The maximum leakage current allowed more than IGBT, controller 80 then judges that the IGBT4 of the branch road breaks down, and records the IGBT4's Sequence number, if for example, the electric current of left side branch road is more than the first current threshold I1, record the sequence number of IGBT4 in the branch road of the left side；Such as Electric current I of each branch road of fruit when IGBT3 is opened and IGBT4 is turned off is less than or equal to the first current threshold I1, and controller 80 is then controlled Make the IGBT3 shut-offs of each branch road and IGBT4 is open-minded, if electric current of any one branch road when IGBT3 is turned off and IGBT4 is opened I is more than the first current threshold I1, and controller 80 then judges that the IGBT3 of the branch road breaks down, and records the sequence number of the IGBT3, For example, if the electric current of left side branch road is more than the first current threshold I1, the sequence number of IGBT3 in the branch road of the left side is recorded.

Further, controller 80 determines whether failure logging.If failure logging, the then control input of controller 80 Output module 90 sends the 5th prompt message, that is, notifies IGBT3 the or IGBT4 failures of the corresponding sequence number of user, and controls failure Detection terminates；If controller 80 does not have failure logging, controller 80, which is then sent, opens control signal, to pass through drive circuit 60 Drive each branch road IGBT3 and IGBT4 it is of short duration open preset time, current detection module 70 continues to detect each branch road Electric current, and the electric current sampled is sent to controller 80, controller 80 analyzes and processes to electric current, and judges whether each Electric current I of the branch road when IGBT3 and IGBT4 are opened is all higher than the 3rd current threshold I3, if it is determined that each branch road in IGBT1 and Electric current I when IGBT2 is opened is all higher than the 3rd current threshold I3, and controller 80 then judges that the IGBT3 and IGBT3 of each branch road are equal Do not break down.And then controller 80 controls switching off for the second relay 302, and control the switch of the first relay 301 Closure, that is, control low tension source 20 to stop powering to power switching modules 50, and control high-tension electricity source 10 to power switch Module 50 is powered, meanwhile, the control input output module 90 of controller 80 sends the 3rd prompt message, that is, notifies user to complete circuit High pressure on electricity, and control fault detect to terminate；If it is determined that electric current I of any one branch road when IGBT3 and IGBT4 are opened is small In or equal to the 3rd current threshold I3, controller 80 then judges that the IGBT3 or IGBT4 of the branch road break down, and records the branch The sequence number on road, if for example, the electric current of left side branch road is less than or equal to the 3rd current threshold I3, the sequence of record left side branch road Number, meanwhile, controller 80 controls switching off for the second relay 302, that is, controls low tension source 20 to stop to power switch Module 50 is powered.And then the control input output module 90 of controller 80 sends the first prompt message, that is, notifies user's current sample The failure of module 70, and control fault detect to terminate.

According to another specific embodiment of the present invention, as shown in figure 5, power switching modules 50 may include two branch roads, And the annexation of power switch pipe connects for H bridge type, each branch road includes IGBT3 and IGBT4, wherein, IGBT3 is upper bridge work( Rate switching tube, IGBT4 are lower bridge power switch pipe.In embodiments of the present invention, load 501 can be single-phase asynchronous motor, this hair The specific operation principle of bright embodiment is identical with the operation principle of the embodiment shown in Fig. 4, and this is no longer going to repeat them.

It should be noted that the failure detector of the embodiment of the present invention can also be high pressure in high-pressure system normal operation When power supply is that high-pressure system is powered, fault detect is carried out to power switching modules.If failure detector detects that power is opened Close module to break down, then the connection for controlling high voltage power supply to disconnect with high-pressure system controls the first relay 30 to disconnect, with right High-pressure system carries out insulation blocking, and the malfunction of output system in real time, to be warned to user, so as to improve and be The security of system.

In one particular embodiment of the present invention, the current detecting of each branch road can be mixed into electric current inspection all the way Survey, so as to reduce cost, reduce the complexity of circuit system.

In another specific embodiment of the present invention, the failure detector of the embodiment of the present invention can apply to rectification In circuit or inverter circuit, its operation principle and circuit structure are essentially identical with the embodiment of the present invention, and this is no longer going to repeat them.

It should be noted that the independent test system different from low-pressure system can be used to carry out power in high-pressure system The fault detect of switch module, wherein, the power supply of test system is not influenceed by high-pressure system, and can control test system The fault detect of power switching modules is carried out before electricity in high pressure.

To sum up, the failure detector of power switching modules, high pressure in the high-pressure system proposed according to embodiments of the present invention Power end and low tension source are connected by changeover module with the feeder ear of power switch pipe, and controller is in control high-tension electricity source Before being powered to power switching modules, low tension source is first controlled to power and control power switching modules to power switching modules It is operated in default detection state, the electric current of current sample module samples power switch pipe, and then, controller is according to current sample mould The current value that block samples judges whether power switching modules break down.Thus, the embodiment of the present invention is in control high voltage power supply Hold before being powered to power switching modules, low-tension supply can be used to carry out the fault detect of power switching modules, so as to significantly Reduce the risk of fault detect, prevent to cause accident because of power switching modules failure, avoid load in circuit and The circuit of other parts is damaged by high-voltage great-current, improves the safety and reliability of system.

Fig. 6 is the block diagram of high-pressure system according to embodiments of the present invention.As shown in fig. 6, the high-pressure system 200 is wrapped Include the failure detector 100 of power switching modules in high-pressure system.

To sum up, the high-pressure system proposed according to embodiments of the present invention, power switching modules in above-mentioned high-pressure system are passed through Failure detector, before control high-tension electricity source is powered to power switching modules, low-tension supply can be used to carry out power The fault detect of switch module, so as to greatly reduce the risk of fault detect, prevent because of power switching modules failure and Cause accident, avoid the circuit of the load in circuit and other parts from being damaged by high-voltage great-current, improve the security of system And reliability.

Fig. 7 is the block diagram of electric automobile according to embodiments of the present invention.As shown in fig. 7, the electric automobile 300 wraps Include high-pressure system 200.

To sum up, the electric automobile proposed according to embodiments of the present invention, by above-mentioned high-pressure system, in control high-tension electricity source Before being powered to power switching modules, low-tension supply can be used to carry out the fault detect of power switching modules, so as to drop significantly The low risk of fault detect, prevents to cause accident because of power switching modules failure, avoids load in circuit and its He is damaged the circuit of part by high-voltage great-current, improves the safety and reliability of automobile.

Fig. 8 is the flow chart of the fault detection method of power switching modules in high-pressure system according to embodiments of the present invention. Wherein, failure detector includes high-tension electricity source and low tension source, and the first supply voltage U1 that high-tension electricity source provides is big In the second source voltage U2 that low tension source provides, as shown in figure 8, this method comprises the following steps：

S10：The electric current of sampled power switch module.

S20：Control low tension source is powered to power switching modules and controls power switching modules to be operated in default inspection Survey state, and judge whether power switching modules break down according to the electric current of the power switching modules sampled.

Specifically, before electric i.e. control high-tension electricity source is powered to power switching modules on horizontal high voltage is entered, first Fault detect is carried out to power switching modules, control low tension source to be powered to power switching modules first, and control power to open Close module and be operated in default detection state.

Further, when power switching modules are operated in default detection state, real-time detection stream overpower switch module Electric current, and judge whether power switching modules break down according to the electric current sampled.

If it is determined that power switching modules break down, then alert, and control high-pressure system disconnection and other The connection of system, to isolate the high-pressure system；If it is determined that power switching modules do not break down, then control high-tension electricity source to Power switching modules are powered, and control low tension source to stop powering to power switching modules.

Thus, the embodiment of the present invention can use low pressure before control high-tension electricity source is powered to power switching modules Power supply carries out the fault detect of power switching modules, so as to greatly reduce the risk of fault detect, prevents because power is opened Close module failure and cause accident, avoid the circuit of the load in circuit and other parts from being damaged by high-voltage great-current, improve The safety and reliability of system..

According to one embodiment of present invention, power switching modules include at least one branch road, and each branch road is included at least One power switch pipe, method also include：The corresponding electric current for gathering at least one branch road；Phase is judged according to the electric current of each branch road Answer whether each power switch pipe in branch road breaks down.In an embodiment of the present invention, using power switching modules as detection Object, when power switch pipe breaks down, the resistance characteristic of power switch pipe changes, and normally behaves as resistance significantly Reduce, flow through the electric current I increases of power switching modules.So, the work(in each branch road can be judged according to the electric current of each branch road Whether rate switching tube breaks down.In an embodiment of the present invention, power switching modules can be applicable to electric automobile or other In high-pressure system.When power switch pipe does not receive drive signal, if any one branch road is when power switch pipe turns off Electric current I is more than the first current threshold I1, illustrates the resistance of the power switch pipe of the branch road and reduces, then judges that the power of the branch road is opened Pipe is closed to break down.So, electric current I when can be turned off by detecting power switch pipe judges whether power switch pipe occurs event Barrier.

According to one embodiment of present invention, when each branch road includes a power switch pipe, according to each branch road Electric current judges whether each power switch pipe breaks down in respective branch, including：Low tension source is controlled to power switch mould Block is powered, and controls the power switch pipe of each branch road to turn off；If electric current of any one branch road when power switch pipe turns off More than the first current threshold, then judge that the power switch pipe of the branch road breaks down.In an embodiment of the present invention, examined in failure During survey, low-tension supply is powered to power switch pipe, with the working condition of simulated high-pressure system, when all power switch of control When pipe is opened, if the electric current I of each branch road is all higher than the second current threshold I2, illustrate that now high-pressure system is under simulated environment Normal work, then judge that the power switch pipe of each branch road does not break down.

According to one embodiment of present invention, if electric current of each branch road when power switch pipe turns off is respectively less than or waited In the first current threshold, then the power switch pipe of each branch road is controlled to open preset time；If each branch road is in power switch Electric current when pipe is opened is all higher than the second current threshold, then judges that the power switch pipe of each branch road does not break down, wherein, Second current threshold is more than or equal to the first current threshold.

According to one embodiment of present invention, if electric current of any one branch road when power switch pipe is opened is less than or waited In the second current threshold, then judge that the power switch pipe of the branch road breaks down.

According to one embodiment of present invention, if it is determined that power switching modules do not break down, then low-tension supply is controlled End stops powering to power switching modules, and controls high-tension electricity source to be powered to power switching modules.

According to one embodiment of present invention, low tension source and high voltage power supply are controlled before fault detect pattern is entered End stops powering to power switching modules, and judges whether the electric current of each branch road is zero, if there is the electricity of a branch road Stream is not zero, then judges that current sample module breaks down.In an embodiment of the present invention, current sample module is used to sample respectively The electric current I of branch road, before fault detect is carried out, it is necessary first to school zero is carried out to current sample module, when current sample module When electric current I under the original state detected in each branch road is zero, the success of current sample module school zero.And then can be according to electricity The current value of stream sampling module sampling judges whether the power switch pipe of each branch road breaks down.

Specifically, as shown in figure 9, when each branch road includes an IGBT, the high pressure system of proposition of the embodiment of the present invention The fault detection method of power switching modules specifically includes following steps in system：

S101：Start-up command is received, carries out the fault detect of power switching modules.

S102：Control low tension source and high-tension electricity source stop powering to power switching modules.

S103：The electric current of each branch road in circuit is detected, and judges whether that the electric current of each branch road is zero.

If it is, perform step S104；If it is not, then perform step S105.

S104：Low tension source is controlled to be powered to power switching modules.

S105：User's current sample module failure is notified, and controls fault detect to terminate.

S106：Judge whether that the electric current I of any one branch road is more than the first current threshold I1.

If it is, perform step S107；If it is not, then perform step S111.

S107：The power switch pipe of respective branch breaks down, and records the sequence number of the power switch pipe to break down.

S108：Control low tension source stops powering to power switching modules.

S109：The electric current I for judging whether each branch road is zero.

If it is, perform step S110；If it is not, then perform step S105.

S110：The sequence number for the power switch pipe that user breaks down is notified, and controls fault detect to terminate.

S111：All power switch pipes are controlled to open preset time.

S112：Judge whether that electric current I of each branch road when power switch pipe is opened is all higher than the second current threshold I2.

If it is, perform step S113；If it is not, then perform step S115.

S113：Control low tension source stops powering to power switching modules, and controls high-tension electricity source to power switch Module for power supply.Now, the power switch pipe of each branch road does not break down.

S114：Notify user to complete electricity in the high pressure of circuit, and control fault detect to terminate.

S115：Judge that the power switch pipe of the branch road breaks down, and record the sequence number of the power switch pipe to break down, The low tension source of the branch road is controlled to stop powering to power switching modules simultaneously.

S116：User's current sample module failure is notified, and controls fault detect to terminate.

According to one embodiment of present invention, when each branch road includes upper bridge power switch pipe and lower bridge power switch pipe When, judge whether each power switch pipe breaks down in respective branch according to the electric current of each branch road, including：Control low tension Source to power switching modules power, and control the upper bridge power switch pipe of each branch road open and lower bridge power switch pipe close It is disconnected；If electric current of any one branch road when upper bridge power switch pipe is opened and lower bridge power switch pipe turns off is more than the first electric current Threshold value, then judge that the lower bridge power switch pipe of the branch road breaks down.In an embodiment of the present invention, power switching modules can be set Put in bridge circuit, now, power switching modules include multiple branch roads, and each branch road includes two power switch pipes, i.e., Upper bridge power switch pipe and lower bridge power switch pipe.If electric current I of any one branch road when power switch pipe turns off is more than the One current threshold I1, illustrating the resistance of the power switch pipe of the branch road reduces, then judges that event occurs for the power switch pipe of the branch road Barrier.So, can first control all upper bridge power switch pipes open and lower bridge power switch pipe turn off, with the electricity according to each branch road Stream I judges whether lower bridge power switch pipe breaks down.

According to one embodiment of present invention, if each branch road is opened and lower bridge power switch in upper bridge power switch pipe Electric current when pipe turns off is less than or equal to the first current threshold, then controls the upper bridge power switch pipe shut-off of each branch road and lower bridge work( Rate switching tube is open-minded；If electric current of any one branch road when upper bridge power switch pipe turns off and lower bridge power switch pipe is opened is big In the first current threshold, then judge that the upper bridge power switch pipe of the branch road breaks down.In an embodiment of the present invention, judging Whether the lower bridge power switch pipe of each branch road breaks down and then controls all upper bridge power switch pipe shut-offs and lower bridge work( Whether rate switching tube is open-minded, broken down with bridge power switch pipe in the electric current I judgements according to each branch road.

According to one embodiment of present invention, if each branch road turns off and lower bridge power switch in upper bridge power switch pipe Electric current when pipe is opened is less than or equal to the first current threshold, then the upper bridge power switch pipe and lower bridge power for controlling each branch road are opened Close pipe and open preset time；If each electric current of the branch road when upper bridge power switch pipe and lower bridge power switch pipe are opened is big In the second current threshold, then the upper bridge power switch pipe and lower bridge power switch pipe for judging each branch road do not break down, its In, the second current threshold is more than or equal to the first current threshold.In an embodiment of the present invention, it is low in process fault detection Voltage source is powered to power switch pipe, with the working condition of simulated high-pressure system, when all upper bridge power switch pipes of control are with When bridge power switch pipe is opened, if the electric current I of each branch road is all higher than the 3rd current threshold I3, illustrate that now high-pressure system exists Normal work under simulated environment, then judge that event does not occur for the upper bridge power switch pipe of each branch road and lower bridge power switch pipe Barrier.

According to one embodiment of present invention, if any one branch road is in upper bridge power switch pipe and lower bridge power switch pipe Electric current when opening is less than or equal to the second current threshold, then judges the upper bridge power switch pipe of the branch road or lower bridge power switch Pipe breaks down.

Specifically, as shown in figure 9, when each branch road includes upper bridge power switch pipe, and lower bridge power switch pipe, this hair The fault detection method of power switching modules specifically includes following steps in the high-pressure system that bright embodiment proposes：

S201：Start-up command is received, carries out the fault detect of power switching modules.

S202：Control low tension source and high-tension electricity source stop powering to power switching modules

S203：The electric current of each branch road in circuit is detected, and judges whether that the electric current of each branch road is zero.

If it is, perform step S204；If it is not, then perform step S205.

S204：Low tension source is controlled to be powered to power switching modules.

S205：User's current sample module failure is notified, and controls fault detect to terminate.

S206：Control the upper bridge power switch pipe of each branch road open and lower bridge power switch pipe turn off, judge whether appoint The electric current I of one branch road is more than the first current threshold I1.

If it is, perform step S207；If it is not, then perform step S208.

S207：The lower bridge power switch pipe of respective branch breaks down, and records the lower bridge power switch pipe to break down Sequence number.

S208：Control the upper bridge power switch pipe shut-off of each branch road and lower bridge power switch pipe is open-minded, and judge whether The electric current I of any one branch road is more than the first current threshold I1.

If it is, perform step S209；If it is not, then perform step S210.

S209：The upper bridge power switch pipe of respective branch breaks down, and records the upper bridge power switch pipe to break down Sequence number.

S210：Determine whether failure logging.

If it is, perform step S211；If it is not, then perform step S212.

S211：The sequence number of power switch pipe to break down is notified, and controls fault detect to terminate.

S212：All upper bridge power switch pipes and lower bridge power switch pipe is controlled to open preset time.

S213：Judge whether that the electric current I of each branch road is all higher than the 3rd current threshold I3.

If it is, perform step S214；If it is not, then perform step S216.

S214：Control low tension source stops powering to power switching modules, and controls high-tension electricity source to power switch Module for power supply.Now, the upper bridge power switch pipe of each branch road and lower bridge power switch pipe do not break down.

S215：Notify user to complete electricity in the high pressure of circuit, and control fault detect to terminate.

S216：The upper bridge power switch pipe or lower bridge power switch pipe for judging the branch road break down, and record generation event The sequence number of the branch road of barrier, while control the low tension source of the branch road to stop powering to power switching modules.

S217：User's current sample module failure is notified, and controls fault detect to terminate.

To sum up, the fault detection method of power switching modules in the high-pressure system proposed according to embodiments of the present invention, first Control low tension source to be powered to power switching modules under fault detect pattern again, and control power switch pipe to be operated in default inspection The electric current of survey state, then sampled power switch module, and judge that power is opened according to the electric current of the power switching modules sampled Close whether module breaks down.Thus, the embodiment of the present invention, can before control high-tension electricity source is powered to power switching modules To carry out the fault detect of power switching modules using low-tension supply, so as to greatly reduce the risk of fault detect, prevent from sending out It is raw to cause accident because of power switching modules failure, avoid the circuit of the load in circuit and other parts from being damaged by high-voltage great-current It is bad, improve the safety and reliability of system.

In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or Position relationship, it is for only for ease of and describes the present invention and simplify description, rather than indicates or imply that signified device or element must There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.

In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three It is individual etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc. Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects Connect or electrically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be in two elements The connection in portion or the interaction relationship of two elements, limited unless otherwise clear and definite.For one of ordinary skill in the art For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.

In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature It is that the first and second features directly contact, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height and is less than second feature.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area Art personnel can be tied the different embodiments or example and the feature of different embodiments or example described in this specification Close and combine.

Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned Embodiment is changed, changed, replacing and modification.

Claims

A kind of 1. failure detector of power switching modules in high-pressure system, it is characterised in that including：

High-tension electricity source and low tension source, wherein, the first supply voltage that the high-tension electricity source provides is more than the low pressure The second source voltage that power end provides；

Changeover module, the first end of the changeover module are connected with the high-tension electricity source, the second end of the changeover module with The low tension source is connected, and the 3rd end of the changeover module is connected with the feeder ear of the power switching modules, described to cut Component is changed to be used to control the high-tension electricity source or the low tension source to power to the power switching modules；

Drive circuit, the drive circuit are connected with the control pole of the power switching modules, to drive the power switch mould Block；

Current sample module, the current sample module are used for the electric current for sampling the power switching modules；

Controller, the controller are connected with the changeover module, the drive circuit and the current sample module respectively, institute State controller to be used to be controlled the changeover module and the drive circuit, to control the low tension source to the work( Rate switch module is powered and controls the power switching modules to be operated in default detection state, and according to the current sample mould The electric current for the power switching modules that block samples judges whether the power switching modules break down.
2. the failure detector of power switching modules in high-pressure system according to claim 1, it is characterised in that described Power switching modules include at least one branch road, and each branch road includes at least one power switch pipe, wherein,

The current sample module includes at least one current sampling unit, and at least one current sampling unit is used for corresponding The electric current of at least one branch road is gathered, the controller is used to judge in respective branch each according to the electric current of each branch road Whether power switch pipe breaks down.
3. the failure detector of power switching modules in high-pressure system according to claim 2, it is characterised in that when every When individual branch road includes a power switch pipe,

The controller is used to control the low tension source to power to the power switching modules, and controls the work(of each branch road Rate switching tube turns off, described if electric current of any one branch road when power switch pipe turns off is more than first current threshold Controller then judges that the power switch pipe of the branch road breaks down.
4. the failure detector of power switching modules in high-pressure system according to claim 3, it is characterised in that if Electric current of each branch road when power switch pipe turns off is respectively less than or then controls each equal to the first current threshold, the controller The power switch pipe of branch road opens preset time, if each electric current of the branch road when power switch pipe is opened is all higher than the second electricity Threshold value is flowed, then judges that the power switch pipe of each branch road does not break down, wherein, second current threshold is more than or equal to First current threshold.
5. the failure detector of power switching modules in high-pressure system according to claim 4, it is characterised in that if Electric current of any one branch road when power switch pipe is opened is less than or equal to second current threshold, and the controller then judges The power switch pipe of the branch road breaks down.
6. the failure detector of power switching modules in high-pressure system according to claim 2, it is characterised in that when every When individual branch road includes upper bridge power switch pipe and lower bridge power switch pipe,

The controller is used to control the low tension source to power to the power switching modules, and controls the upper of each branch road Bridge power switch pipe is opened and lower bridge power switch pipe turns off, if any one branch road is opened and lower bridge in upper bridge power switch pipe Electric current when power switch pipe turns off is more than first current threshold, and the controller then judges that the lower bridge power of the branch road is opened Pipe is closed to break down.
7. the failure detector of power switching modules in high-pressure system according to claim 6, it is characterised in that if Electric current of each branch road when upper bridge power switch pipe is opened and lower bridge power switch pipe turns off is less than or equal to first electric current Threshold value, the controller then controls the upper bridge power switch pipe shut-off of each branch road and lower bridge power switch pipe is open-minded, if appointed Electric current of one branch road when upper bridge power switch pipe turns off and lower bridge power switch pipe is opened is more than first current threshold, The controller then judges that the upper bridge power switch pipe of the branch road breaks down.
8. the failure detector of power switching modules in high-pressure system according to claim 7, it is characterised in that if Each electric current of the branch road when upper bridge power switch pipe turns off and lower bridge power switch pipe is opened is less than or equal to first electric current Threshold value, the controller then control the upper bridge power switch pipe of each branch road and lower bridge power switch pipe to open preset time, such as Electric current of each branch road of fruit when upper bridge power switch pipe and lower bridge power switch pipe are opened is all higher than the 3rd current threshold, then sentences The upper bridge power switch pipe and lower bridge power switch pipe of disconnected each branch road do not break down, wherein, the 3rd current threshold More than or equal to first current threshold.
9. the failure detector of power switching modules in high-pressure system according to claim 8, it is characterised in that if Electric current of any one branch road when upper bridge power switch pipe and lower bridge power switch pipe are opened is less than or equal to the 3rd electric current Threshold value, the controller then judge that the upper bridge power switch pipe of the branch road or lower bridge power switch pipe break down.
10. the failure detector of power switching modules, its feature exist in the high-pressure system according to claim 2 or 4 or 8 In when judgement is not broken down, the controller is additionally operable to control the low tension source to stop to the power switch mould Block is powered, and controls the high-tension electricity source to be powered to the power switching modules.
11. the failure detector of power switching modules in the high-pressure system according to Claims 2 or 3 or 6, its feature exist In the controller is additionally operable to control the low tension source and the high voltage power supply before the fault detect pattern is entered End stops powering to the power switching modules, and judges whether the electric current of each branch road is zero, if there is a branch road Electric current be not zero, then judge that the current sample module breaks down.
12. the failure detector of power switching modules in high-pressure system according to claim 1, it is characterised in that institute Stating changeover module includes：

First relay, the first end of the switch of first relay are connected with the high-tension electricity source, first relay Second end of the switch of device is connected with the feeder ear of the power switching modules, coil and the control of first relay Device is connected；

Second relay, the first end of the switch of second relay are connected with the low tension source, second relay Second end of the switch of device is connected with the feeder ear of the power switching modules, coil and the control of second relay Device is connected；

Wherein, the controller is by controlling the switch of first relay to open so that the high-tension electricity source is to the work( Rate switch module is powered, and by controlling the switch of second relay to open so that the low tension source is to the power Switch module is powered.
13. the failure detector of power switching modules in high-pressure system according to claim 12, it is characterised in that institute State the counnter attack protection that changeover module also includes being connected between second relay and the feeder ear of the power switching modules Circuit.
14. a kind of high-pressure system, it is characterised in that including power switch mould in the high-pressure system according to claim 1-13 The failure detector of block.
15. a kind of electric automobile, it is characterised in that including high-pressure system according to claim 14.
A kind of 16. fault detection method of power switching modules in high-pressure system, it is characterised in that the failure detector bag High-tension electricity source and low tension source are included, the high-tension electricity source provides the first supply voltage and provided more than the low tension source Second source voltage, the described method comprises the following steps：

Sample the electric current of the power switching modules；

The low tension source is controlled to the power switching modules to power and control the power switching modules to be operated in pre- If the state of detection, and judge whether the power switching modules occur event according to the electric current of the power switching modules sampled Barrier.
17. the fault detection method of power switching modules in high-pressure system according to claim 16, it is characterised in that institute Stating power switching modules includes at least one branch road, and each branch road includes at least one power switch pipe, and methods described also includes：

The corresponding electric current for gathering at least one branch road；

Judge whether each power switch pipe breaks down in respective branch according to the electric current of each branch road.
18. the fault detection method of power switching modules in high-pressure system according to claim 17, it is characterised in that when When each branch road includes a power switch pipe, the electric current of each branch road of basis judges each power switch in respective branch Whether pipe breaks down, including：

Control the low tension source to be powered to the power switching modules, and control the power switch pipe of each branch road to turn off；

If electric current of any one branch road when power switch pipe turns off is more than first current threshold, the branch road is judged Power switch pipe breaks down.
19. the fault detection method of power switching modules in high-pressure system according to claim 18, it is characterised in that

If electric current of each branch road when power switch pipe turns off is respectively less than or equal to the first current threshold, controls each branch The power switch pipe on road opens preset time；

If each electric current of the branch road when power switch pipe is opened is all higher than the second current threshold, the work(of each branch road is judged Rate switching tube does not break down, wherein, second current threshold is more than or equal to first current threshold.
20. the fault detection method of power switching modules in high-pressure system according to claim 19, it is characterised in that such as Electric current of any one branch road of fruit when power switch pipe is opened is less than or equal to second current threshold, then judges the branch road Power switch pipe breaks down.
21. the fault detection method of power switching modules in high-pressure system according to claim 17, it is characterised in that when When each branch road includes upper bridge power switch pipe and lower bridge power switch pipe, the electric current of each branch road of basis judges corresponding branch Whether each power switch pipe breaks down in road, including：

Control the low tension source to be powered to the power switching modules, and control the upper bridge power switch pipe of each branch road to open Logical and lower bridge power switch pipe shut-off；

If electric current of any one branch road when upper bridge power switch pipe is opened and lower bridge power switch pipe turns off is more than described the One current threshold, then judge that the lower bridge power switch pipe of the branch road breaks down.
22. the fault detection method of power switching modules in high-pressure system according to claim 21, it is characterised in that

If electric current of each branch road when upper bridge power switch pipe is opened and lower bridge power switch pipe turns off is less than or equal to described First current threshold, then control the upper bridge power switch pipe shut-off of each branch road and lower bridge power switch pipe is open-minded；

If electric current of any one branch road when upper bridge power switch pipe turns off and lower bridge power switch pipe is opened is more than described the One current threshold, then judge that the upper bridge power switch pipe of the branch road breaks down.
23. the fault detection method of power switching modules in high-pressure system according to claim 22, it is characterised in that

If electric current of each branch road when upper bridge power switch pipe turns off and lower bridge power switch pipe is opened is less than or equal to described First current threshold, the then upper bridge power switch pipe and lower bridge power switch pipe for controlling each branch road open preset time；

If each electric current of the branch road when upper bridge power switch pipe and lower bridge power switch pipe are opened is all higher than the 3rd current threshold Value, the then upper bridge power switch pipe and lower bridge power switch pipe for judging each branch road do not break down, wherein, the 3rd electricity Stream threshold value is more than or equal to first current threshold.
24. the fault detection method of power switching modules in high-pressure system according to claim 23, it is characterised in that such as Electric current of any one branch road of fruit when upper bridge power switch pipe and lower bridge power switch pipe are opened is less than or equal to the described 3rd electricity Threshold value is flowed, then the upper bridge power switch pipe or lower bridge power switch pipe for judging the branch road break down.
25. the fault detection method of power switching modules in the high-pressure system according to claim 17 or 19 or 23, it is special Sign is, when judging not break down, controls the low tension source to stop powering to the power switching modules, and control The high-tension electricity source is powered to the power switching modules.
26. the fault detection method of power switching modules in the high-pressure system according to claim 17 or 18 or 21, it is special Sign is, controls the low tension source and the high-tension electricity source to stop to institute before the fault detect pattern is entered Power switching modules power supply is stated, and judges that whether the electric current of each branch road is zero, is not zero if there is the electric current of a branch road, Then judge that the current sample module breaks down.